Just got some 124grain 9MM LRN and want to use the powder I have on hand W231 been using 115grain FMJ with 4.5 of W231.But can't come up with any info in my books or internet what grain to use of W231 with the .356 124g LRN any ideas ?????

Russ;
In general, a cast or lead bullet can use the same load as a jacketed bullet, of the same weight.
Usually, the cast or lead bullet will develope lower pressures as the jacketed bullets are harder to push through the bore and develope more back pressure and also velocity, reason cast and lead bullet loads often use a slightly faster powder for the same velocity as jacketed bullets of the same weight.
Example, my .35 Whelen, 200gr Rem. psp, 40gr Varget, 1920fps, 214gr rn gc , 40gr Varget, 1730fps, but 40gr IMR 4198 with the 214gr rn gc gives 2380fps.
Don

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